MetaWhere offers the ability to call any Arel predicate methods
(with a few convenient aliases) on your Model's attributes instead
of the ones normally offered by ActiveRecord's hash parameters. It also
adds convenient syntax for order clauses, smarter mapping of nested hash
conditions, and a debug_sql method to see the real SQL your code is
generating without running it against the database. If you like the new
AR 3.0 query interface, you'll love it with MetaWhere.